I need help decoding theses 4 chevy block

Discussion in '1978 - 1981 Specific' started by Renkotsu, Jul 23, 2019.

  1. Renkotsu

    Renkotsu New Member

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    first block is in a 81 camaro Berlinetta

    Im not sure if i need the tag from the firewall since i know the motor is not the original , it has a 350 and i dont know which car it came from or the year

    Casting is 3970010

    Engine code
    K0424T4X c91184524

    The second car is a 79 z28 and im kinda screwed the tag is barely noticeable there are a couple of number that faded away i tried sanding it a little but the first couple of numbers are just impossible to see

    Block casting is the same 3970010

    Engine code
    T0853DRH or K0853DRH The first letter is to hard to see

    there is also this but i cannot see the first couple of numbers 501428

    I have two last block one is in my 85 s10 when i bought it theguy told me it was a 350 i cannot see the casting number behind the valves cover because the number are hidden under the firewall,

    i got the code from the alternator side

    Code 231521914 K05 07 CKL


    Last motor is from a 78 camaro

    Code 131174051 K03 26 CKL


    Sorry for the walls of text i dont mind trying to decode them if someone has a site.

    Im kinda bummed about the z28 since it is the only one i plan to keep beside the s10 and the number code is just too far gone to get the full code , if i have a chance i will take a picture.
     
  2. Gary S

    Gary S Administrator Lifetime Gold Member

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  3. Renkotsu

    Renkotsu New Member

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    Ok so far i got the 81 block decoded but im not sure about the T4X code i couldn't find it in the list apparently T is for truck but the rest im not sure

    The 79 has a 79 motor in it so it might be the original i will have to check the other 2 number from the tag in the dash and on the firewall maybe ,i dont know if the 3 or 4 number im missing on 501428 is needed to know for sure that it is the original motor.

    And the other 2 ending with CKL have 2 option 1975 and 1973 , 1975 being a 262 v6 and 1973 350 v8

    The site say
     

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